A wireless communications device may include a receiver configured to receive a continuous phase modulation (CPM) signal and a demodulator coupled downstream from the receiver. The demodulator may be configured to generate a CPM correlation matrix based upon an expected CPM signal, and generate a temporary correlation matrix. The temporary correlation matrix may include a first copy of the CPM correlation matrix inverted in time, and a second copy of the CPM correlation matrix.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A wireless communications device comprising: a receiver configured to receive a continuous phase modulation (CPM) signal; and a demodulator coupled downstream from said receiver and configured to generate a complex-valued CPM correlation matrix based upon an expected CPM signal, and generate a temporary correlation matrix comprising a first copy of the complex-valued CPM correlation matrix inverted in time, and a second copy of the complex-valued CPM correlation matrix.
2. The wireless communications device of claim 1 , wherein said demodulator is configured to generate the temporary correlation matrix comprising a third copy of the complex-valued CPM correlation matrix inverted in time.
3. The wireless communications device of claim 2 , wherein said demodulator is configured to generate the temporary correlation matrix having a size three times larger than a size of the complex-valued CPM correlation matrix.
4. The wireless communications device of claim 1 , wherein said demodulator is configured to apply a filter to the temporary correlation matrix.
5. The wireless communications device of claim 4 , wherein said filter comprises a Chebyshev filter.
6. The wireless communications device of claim 4 , wherein said filter comprises a multipath filter.
7. The wireless communications device of claim 4 , wherein said filter comprises a satellite communications channel filter.
8. The wireless communications device of claim 7 , wherein said satellite communication channel filter comprises an ultra high frequency follow-on (UFO) satellite communications filter.
9. The wireless communications device of claim 8 , wherein said UFO filter comprises a 5 kHz UFO channel filter.
10. The wireless communications device of claim 1 , wherein said demodulator is configured to demodulate the received CPM signal using a multiple of 4-ary modulation.
11. The wireless communications device of claim 1 , wherein said demodulator is configured to generate the complex-valued CPM correlation matrix as a 3 symbol correlation matrix.
12. A wireless communications device comprising: a receiver configured to receive a continuous phase modulation (CPM) signal; and a demodulator coupled downstream from said receiver and configured to generate a complex-valued CPM correlation matrix based upon an expected CPM signal, generate a temporary correlation matrix comprising a first copy of the complex-valued CPM correlation matrix inverted in time, a second copy of the complex-valued CPM correlation matrix, and a third copy of the complex-valued CPM correlation matrix inverted in time, and apply a satellite communications channel filter to the temporary correlation matrix.
13. The wireless communications device of claim 12 , wherein said demodulator is configured to generate the temporary correlation matrix having a size three times larger than a size of the complex-valued CPM correlation matrix.
14. The wireless communications device of claim 12 , wherein said satellite communications filter comprises an ultra high frequency follow-on (UFO) satellite communications filter.
15. The wireless communications device of claim 14 , wherein said UFO filter comprises a 5 kHz UFO channel filter.
16. The wireless communications device of claim 12 , wherein said demodulator is configured to demodulate the received CPM signal using a multiple of 4-ary modulation.
17. A method of demodulating a continuous phase modulation (CPM) signal with a wireless communications device comprising a demodulator coupled downstream from a receiver, the method comprising: generating a complex-valued CPM correlation matrix based upon an expected CPM signal using the demodulator; generating a temporary correlation matrix, using the demodulator, comprising a first copy of the complex-valued CPM correlation matrix inverted in time, and a second copy of the complex-valued CPM correlation matrix.
18. The method of claim 17 , further comprising generating the temporary correlation matrix comprising a third copy of the complex-valued CPM correlation matrix inverted in time using the demodulator.
19. The method of claim 18 , comprising generating the temporary correlation matrix to have a size three times larger than a size of the complex-valued CPM correlation matrix.
20. The method of claim 17 , further comprising applying a filter to the temporary correlation matrix using the demodulator.
21. The method of claim 20 , wherein applying the filter to the temporary correlation matrix comprises applying a Chebyshev filter to the temporary correlation matrix.
22. The method of claim 20 , wherein applying a filter to the temporary correlation matrix comprises applying a multipath filter to the temporary correlation matrix.
23. The method of claim 20 , wherein applying a filter to the temporary correlation matrix comprises applying a satellite communications channel filter to the temporary correlation matrix.
24. The method of claim 23 , wherein applying the satellite communications channel filter to the temporary correlation matrix comprises applying an ultra high frequency follow-on (UFO) satellite communications filter to the temporary correlation matrix.
25. The method of claim 24 , applying the ultra high frequency follow-on (UFO) satellite communications filter to the temporary correlation matrix comprises applying a 5 kHz UFO channel filter to the temporary correlation matrix.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
February 16, 2012
September 15, 2015
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